2006 ICD-9-CM Volume 1 Diagnosis Codes > Diseases Of The Nervous System And Sense Organs 320-389 320-327 Inflammatory diseases of the central nervous system 330-338 Hereditary and degenerative diseases of the central nervous system 340-349 Other disorders of the central nervous system 350-359 Disorders of the peripheral nervous system 360-379 Disorders of the eye and adnexa 380-389 Diseases of the ear and mastoid process